Carotenoids might help fight serious infections in people who have compromised immunity systems by boosting their white blood cell count. Lycopene has been associated with a reduced incidence of several types of cancer, including prostate cancer, colon cancer, bladder cancer and lung cancer. Zeaxanthin and lutein are believed to strengthen the eyes, protecting against cataracts and macular degeneration. Although some of these connections have yet to be clearly established through scientific studies and research, health experts typically recommend that people should consume the recommended daily amounts of fruits and vegetables to get the full benefits of carotenoids.